"Got one, Hal!" said Chester, quietly.

"Good!"

Came a volley of small arm fire from behind and bullets whined about the
four friends. Again Chester and Colonel Anderson fired almost
simultaneously and again their efforts were rewarded. A second man was
put out of the fight, as they could see.

At this moment Stubbs came into action.

He arose from his seat and, grasping the side of the speeding craft with
his left hand for support, stood to his full height. His right arm drew
back, then flashed sharply forward again and a small object went spinning
through the air toward the Austrian airship.

It struck home and there was a terrible explosion, followed by several
sharp cries of pain, as the Austrian airship seemed to split into a
thousand pieces. A moment later these pieces disappeared.

The three friends turned upon Stubbs.

"What is this, magic?" asked Chester in surprise.

"No," replied Stubbs, quietly. "Melenite. I just happened to see a stick
of it here, so I threw it."

"Well, you did a pretty good job, Stubbs," said Colonel Anderson.